Die-head



G. T. SHEAREB.

DIE HEAD. APPLlCATlON FILED MA. 20, 1920.

1,397,238, PatentedN0v.15,1921.

3 SHEETS-SHEET I.

G. T. SHEARER.

DIE HEAD.

APPLlCATlON FILED MAR. 20, i920.

1,397,238., Patented Nov.. 15, 1921.

3 SHEETS-SHEET 2.'

PATENT ferries.

d nin-HEAD.

Specification of Letters Eatent.

Patented Nov. 15, 1921.

`Application filed March 20, 1920. Serial No. 367,546.

To all whom it may concern.'

Be it known that I, GEORGE T. SHEARER, a citizen of the United States, residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Die- Heads, of which the following is a specification.

The present invention relates to die heads,

4and more particularly those employed in threading rods, bolts and the like. The primary object is to provide a ,structure that is exceedingly compact and relatively simple, the parts being effectively supported at all points so as to obviate any danger of yielding on the part of the cutters, with consequent defective work.

A further and important object is to provide a structure which can be readily altered to cut either right or left-hand threads and which can be easily adjusted to operateon work of different diameters.

In the accompanying drawing which shows the preferred embodiment of the invention, Figure 1 is a front elevation of the head with one of the cutters removed from its holder and one of the holders removed from its carrier.

Fig. 2 is a view partly in side elevation and partly in longitudinal section,

Fig. 3 is a detail sectional view on the line 3-3 of Fig. l,

Figs. tand 5 are sectional views on the lines 4 4 of 5 5 of Fig. 3,

Fig. 6 is a face View of one of the cutter holders,

Fig. 7 is a side elevation of the same, and

Fig. 8 is an end view.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

ln the embodiment disclosed, a body is employed consisting of a head 9 and a shank 10, said body having an axial work-receiving bore 11. The body is provided on different sides of the bore 11 with a plurality of sockets 12 having reduced rear portions 13, and in these sockets are rotatably mounted carriers in the form of gudgeons 14 having reduced stems 15 in the reducedportions 13 of the sockets. The carriers are held in place by any suitable means, as for example, retaining disks 16 mounted on the rear ends of the stems 15 and held in place by suitable screws 17. The front faces of the carriers are flush with the face of the kbody and are provided with recessed Aseats in the formv of transverse slots 1,8 that openr through the inner sides of the gudgeons, the outer ends terminating short of the outer sides'ofsaid gudgeons. l

In the seat 18 are adapted to be fitted detachable cutter holders in the form kof blocks 1,9 that snugly fit in said seats and project .from the inner open ends thereof. The cutter holders furthermore preferably have sockets 20 in their inner ends` that receive posts 21 projecting into the inner ends of the recesses 18, as illustrated in Fig. 2. The cutter holders have longitudinal slots 22 for the reception` of the usualcutters 23, and said holders preferably have extensions 24; that `back upthe projecting portions of the cutters, as illustrated in Fig. 1. The bottoms of the slots 22 are preferably inclined to suit the `particular pitch of the thread being cut, as will be readily understood to those skilled in the art. Each of thecutter holders 19 is held in its seat by screws 25 that pass throughthe holder at one side of the slot 22, and are threaded into the carrier 14, as shown in Fig. 2. Twosets of openings 25a are provided to receive the screws 25, one set for right hand cutters, the others for left-hand cutters. The heads of these screws overlap the slots 22, and engaging over thecutters 23, serve to also hold the cutters in the` holders. Preferably also an intermediate screw 26 is employed that does not pass through the holder 19but serves as a supplemental fastening to secure the cutter to the holder. Each of the holders is also provided with a longitudinally Inovable abutment screw 27 threaded into the holder and extending across the slot 22, the said screw thus acting to bear against the rear end of the cutter23. rFhese screws 27 are accessible for operation through openings 27 l formed in the body and carriers 14.

Each of the carriers 14 is provided directly in rear of the cutter holder seats 18 with oppositely disposed shoulders 28 and 29, and extending from these shoulders are radial sockets 3() adapted to receive plungers 81. The lower ends of each of the plungers are adapted to engage with both of the oppositely disposed shoulders of adjacent carriers, as shown in Fig. 4. The inner ends of the plungers are preferably provided with rounded bearing ribs 31EL and the shoulders are recessed to receive the same, as shown. vThese plungers 3l haveV their outer ends beveled asshovvn at 32, and said beveled ends are adapted to project into keyways 33 formed longitudinally in the periphery of the body 9. An actuating ring 34 surrounds and is longitudinally slidableupon the body 9, being provided with an annular groove 35 for receiving an operating yoke or device not shown. This ring is provided With notches 36 that are alined With the keyWays 33, and the bottoms'thereof are inclined as shown at 37. Keys 38 are located in the keyWays 33 and are secured to the ring 34 by suitable screws 39 and pins 40.y The front ends of the keys 38 are beveled to correspondto the beveled bottoms 37 of the notches 36, and these beveled surfaces cooperate With the beveled outer ends32 of the plungers 31. With this construction, it will be evident that lWhen the ring is-moved toward the front end of the die head the beveled bottoms 37 of the notches 36 and the beveled ends of the keys 38 will cause the yplungers to be moved inwardly and said plungers acting on. the shoulders28 vorV 29 will turn the carriers to carry the cutters 23 to their operative positions and will hold them positively in such positions. p

To sWing the cutters outwardly or away from the Work the following mechanism is preferably employed. The carriers 14 are providedin rear of the shoulders 28 with other oppositely arranged shoulders 4l and 42, and extending radially therefrom are sockets 43 in which are located coiled springs 44 that bear against the shoulders 4l and 42 respectively. These springs have their outer ends bearing against abutment screws 45 threaded into the sockets and preferably having guide stems 46 extending into the springs. Those springs 44 which are to act inopposition to the plungers 31 are'placed under tension by moving inwardly the screws v45 abutting thereagainst, While the tension of the other springs is released by moving thescreivs bearing thereagainst to` their outer limit, as shown.

.Vith the construction as illustrated, it will be evident tiat-Whenthe cutters are in their innermost positions as shown in Fig. l, each plunger' 3l will be at its innermost positions, as shoivn in Fig. 3, and acting against the shoulders 28. The active springs 44'for each plunger Will beunder full compression and 'operating against the shoulder 4l on the opposite side of the carrier to the shoulder 28 against vvhich the plunger 3l bears. Then the actuating and holding ring 34 is moved rearwardly, the plungers being released, will permit Vthe compressed springs 44 to react and turn the carriers to i lmove the cutters outwardly and thereby dis'- engage the Work. ln this action not oniy are the springs 44-which bear against the shoulders 42 inactive, but the shoulders 29 are idle,for being on they same sides of the carriers as the shoulders 3l against Which the active springs bear when said springs act to turn the carriers, the shoulders 29 move away `from the plungers. ,Therefore it Will be clear that in order to cut opposite threads it is only necessary to remove the die holders and substitute them with a reversely arranged set, release the springsV 44 that bear against the shoulders 4l and compressV the springs that operate. against the shoulders 42. The plungers Will noiv act against Athe shoulders 29 Which become active in opposition .to the springs that bear against the shoulders 42 While the shoulders 28 now are idle.

lll/'ith this construction it will be noted that the carriers 14, the'cutter holders 19 and the cutters'are all flush With the face of the body, 'thereby not only providing a compact relatioinbut one in which allthe parts are effectively supported and reinforced throughout their entire width. Consequently there can be no springing orgive during theY cutting action. The parts are moreover very simple and are entirely and easily available, so that adjustment, substitutionand rearrangement can be obtained with ease and expedition. g

From the foregoing, it is thought that the construction, operation andv many advantages of the herein described invention will be apparent to those skilled in the art, Without further description, and it Will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to Withoutv departing from the spirit or sacricing any of the advantages of the invention.

Having thus fully described my invention, What I claim as nevaand desire to secure by Letters Patent, is zy l. In a cutter head, the combination With a supporting body, of a carrier member rotatably niounted'in the body and having its outer face substantially flush With the face of said body,`said' carrier member having a recessed seat in its outer end, and a cutter holder locatedv in said seat andhaving its outeifface lsubstantially flush with the Yface of the carrier member. Y

2. In a cutter head, the combination with a body having a central Work-receiving bore, of a carrier member journaled in and supported by the body at one side of the bore and having its outer face substantially flush with the corresponding face of the body, said member having an elongated recessed iio ist

seatv in its outer end that opens through the Y Leemans holder having a longitudinal cutter-receiving slot opening through its outer side and through the end adjacent to the Work-receiving bore.

3. In a cutter head, the combination with a body, of a carrier member movably mounted therein and having an intermediate elongated recessed seat that opens through the side of the member, a cutter holder detachably mounted in the seatand having a cutter-receiving seat, and common means engaging the holder and carrier for securing the holder to the carrier and having a cutter' engaging portion to secure a cutter in the seat of the holder.

4. Ina cutter head, the combination with a body, of a carrier member movably mounted therein and having an intermediate slot in its outer face opening through one side and forming a recessed seat, a cutter holder detachably mounted in the seat and having an intermediate cutter-receiving recess, and screws that pass through the holder at one side of the seat and engage the carrier to secure the holder thereto, said'screws having heads overlapping the cutter receiving recess to secure a cutter therein.

5. In a cutter head, the combination with a body having a Work-receiving bore and a plurality of sockets around the same,'of carrier trunnions journaled in the sockets and substantially flush with the outer end oi the body, the outer ends of the trunnions having elongated recessed seats, cutter holders detachably engaged in the seats and substantially flush with the trunnio-ns, said holders having slots in their outer portions, cutters in said slots, and screws for securing the holders in their seats, said screws overlapping the cutters andholding them in the slots.

6. In a cutter head, the combination with a body, of a carrier rotatably mounted therein, said body having a keyivay and a socket opening into the keyWay, a plunger in the socket operating on the carrier, and an actuating ring slidable on the body and having a key movable in the keyivay and operating on the plunger.

7. In a cutter head, the combination with a body having an axial Worl -receiving bore and a plurality of external longitudinal keyways, of a plurality of cutter carriers journaled in the body around the bore, said body having substantially radial sockets eX- tending from the carriers to the keyways, plungers slidable in the sockets and operating on the carriers, and an actuating ring slidable longitudinally on the body and having keys in the keyivays that operate on the plungers.

8. In a cutter head, the combination With a body, of a cutter-holding carrier rotatably mounted therein, oppositely acting yielding devices for operating against the carrier,

means for placing either device under tension or relieving the same therefrom, and means for positively moving the carrier against the action of the device that is under tension.

9. In a cutter head, the combination with a body,of a cutter-holding carrier rotatably mounted therein, oppositely acting springs having bearings against the carrier, means for placing either spring under tension or relieving the same therefrom, and means for positively moving the carrier against the action of the device that under tension.

10. In a cutter head, the combination with a body, of a cutter-holding carrier rotatably mounted therein, springs bearing against opposite sides of. the body, screws for putting either spring under tension and relieving the other, and means for rotating the carrier in either direction.

11. In a cutter head, the combination with a body, of a cutter holding carrier rotatably mounted therein and having opposite shoulders, coiled springs bearing against the shoulders, screw plugs threaded in the body and ybearing against the springs, plunger means acting against the carrier, and an actuating device for the plunger means.

12. In a cutter head, the combination with a body having an axial work-receiving bore, of carrier gudgeons journaled in the body on different sides of the bore, cutter holders carried by the body, said gudgeons having opposite shoulders, said body having substantially radial sockets extending from the shoulders, coiled springs in certain of said sockets bearing against the shoulders, abutment screws in the sockets against which the springs bear, plungers in other oi the sockets beharing against the shoulders, and an actuating ring in the body having means for engaging and moving the plungers.

13. In a cutter head, the combination with a body, of a carrier rotatably mounted thereon, spring devices for acting oppositely against the carrier, means for causing either spring device to' be active against the carrier and the other inactive, and devices for respectively acting oppositely against the carrier to move the same and respectively made active or inactive by the activity or inactivity of the spring devices.

14. In a cutter head, the combination with a body, of a carrier rotatably mounted thereon, springs for acting oppositely against the carrier to respectively turn the same in opposite directions, means for placing tension upon either spring or releasing it from tension, devices for respectively moving the carrier positively in either direction and permanently in position to act upon the carrier, and means for simultaneously moving the devices.

15. In a cutter head, the combination with abody, of a carrier rotatably mounted therein and having sets of oppositely disposed shoulders, oppositely acting springs operating on the opposite shoulders of one set, means for placing either spring under tension and relieving such tension, plungers simultaneously inposition to act against the opposite shoulders of the other set, one being maintained inactive with respect to its shoulder by the activity of the spring acting against the Vcorresponding shoulder, and means for operating the plungers.

16. In a cutter head, the combination with a body, of a pair of adjacent carriers rotatably mounted therein, a device in position to simultaneously act on both carriers to turn the same in opposite directions, and spring means acting on one of the carriers to turn it against the action of the device and to turn the other carrier in the same direction as the said device.

17. In a cutter head, the combination with a body, of a pair of adjacent carriers rotatably mounted therein, a plunger operating between the carriers andhaving its opposite f' portions in position to engage the same and turn said carriers in opposite directions, and springs that operate respectively against the carrier to turn one in the same direction as it is moved by the plunger and to turn the other in an opposite direction.

18. In a cutter head, the combination with a body, of a pair of adjacent carriers rotatably `mounted therein, a plunger operating between the carriers and having its opposite portions in position to engage the same and lturn said carriers in opposite directions, a

spring operating against the same side of one carrier as the plunger to move the same in the same direction as the plunger acts, and a spring operating against the opposite side of the other carrier to move the latter in the opposite direction to the action of the plunger.

19. In a cutter head, the combination with a body, of a pair of adjacent carriers rotatably mounted therein, a device in position to simultaneously act on both carriers to .turn the same in opposite directions, spring devices for respectivelylturning each plunger in either of opposite directions, and means for causing certain ot said spring devices to be active and the others inactive and vice versa.

L0. In a cutter head, the combination with a body, of adjacent carriers journaled there-- in, a plunger operating between the carriers and having` opposite portions positioned to act against the carriers and turn them in opposite directions, oppositely acting springs operating on each carrier for turning the same in either direction, and means for placing4 either spring under tension or relieving the tension thereof.

2l. In a cutter head, the combination with a body, of a circular 'series of carriers journaled therein, each having sets of oppositely disposed shoulders, plungers between the carriers having opposite portions in position to act against the shoulders of adjacent carriers to turn the same in opposite directions,

means on the body for simultaneously mov! ing the plungers, springs operating against other of the opposite shoulders of each carrier, and means for placing tension upon the different springs or relieving them of such tension.

In testimony whereof I affix my signature in the presence of two witnesses. GEORGE T. SHE-ARER. lVitnesses:

RUssEL P. HOUR, ALF. H. RUSSELL. 

